Reamer



Patented Feb. e. `1940 v,

,y f UNITED STATES PATENT oFFlcE .REAMER Y. Kenneth. E. Jones, Houston, Tex., assignor to Reed `Rollerit Company,vHouston, Tex., a corporation of vTexas Applieat'ion December 16, 193s, semenl No. 246,182 3 claims., (o1. s55- 73) f This invention relates to reamers and has-particular referencer to a reamer of the roller'type mounted in va portion of a drill stem.

Ihe-genera'l'object of this invention is to provide a'reamer construction of the type vset forth in which the reamer cutter may be readily and rmly mounted in the reamer body. `V'Variousjrneans. have been yprovided for mounting reamer cutters in side recesses in the reamer body in which rthey are carried. Numerous such attempts `have y resulted vin structures which though ythey served as mountings for the cutters were nevertheless not susceptible of easy removal of the'cutters'for replacement and repair. Other types of mountingshave proved to be unsatisfactory in that they' do not form adequate support yfor the cutters andthe cutters are either dis- 'placed byithe stressesenoountered during drilling )or tend to be'coineloosened and in some instances entirely lost.

It is, therefore; an object of this" invention tov panying .drawing wherein one embodiment is set fforth by way of illustration. Itis to be underfstood that-'the embodiment set forth in said draw- '-ing and description is for illustration only and isnot tovbe takenby` Way of limitation. 'v

Figi is a vertical cross'seotional viewthrough along In the illustration shown in the drawing the i numeral I indicates the body of the reamer, this bod-y being formed with a-plurality of major cutter-recesses 2'at spaced points about its outer sur- 'fffaeeand with a longitudinal passageway 3 there-v "portionIB of the block. I3 is of the same width as through. At each end of each of the major rccesses 2 is formed` a minor recess, the lower of these being designated by the numeral Il and the upper by the numeral 5. The ring t lies in an annular recess and overlies `an end portion of 'i5 each of the recesses 4, this ring being formed in twoY parts and kextending entirely about the body I and being Welded in place thereon'as shown at 'I and 8. They are also welded together at their ends as shown at I and 8 in Fig. 6. 'I'he recesses 4 are of uniform width throughout and their bottom surfaces are substantially parallel to theaXis of the reamer body.y Theinner surfacel of the .ring 6 where it overlies the recesses 4 is p-rovided witha slight taper for a portion of i5 its width as illustrated at 9. The upper recess is 'of dovetail shape as illustrated in Figs. 2 and 3,

being wider along its bottom than' along the outer surface of the reamer body.

The reamer-'cutters IG are formed in the usual 20 manner with vcutter rteeth Ii extending longi-` tudinally thereof, orv extending in any other directionl which may be desired, and each of these cutters is rotatably mounted upon a pin I 2. .n Upon the' roller end of the pin i2 is mounted v"a block I3 `having an opening to receive the end of the pin I2, this opening being intersected by a smaller 'opening `I4 into which Welding metal is inserted as shown at I5 after the cutter pin is in place. This serves to Weld'the cutter pin within A:50

the recess inthe blockv I3'. This block I3 has a part I6 extending away from the end of the pin I2 and adapted to lie against the bottom of the vrecess 4'. This part It is tapered on its outer surface to a degree corresponding to the taper s on 3,5 the inside surface of the ring ii. Thus, when the block I3Vis forcedv longitudinally until the part i6 `passes beneath the ring Si, it will be firmly wedged in'place so as to` be held rigidly within the body I.

Inthis connection it may be mentioned that the lo the recess 4 and forms a snug though not tight fit with that recess.`

The upper vend of the pink l2 is likewise inserted y in an upper block I1, having an opening it to ff receive the pin and an opening I9 intersecting the opening I8 for the purpose of receiving weld material 2li-to secure the pinv I2 in place in thev same manner that the pin I2 is secured within the y v blockl I3. .The block Il, however, is of substan- 'U50 ntiallythe same width as the outer portion of the recess 5. 'At its inner portion, the block I'I' is narrower than the recess 5, as illustrated in Fig. 3.

` 'Ihe block H extends beyond the end of the pin yan'djaway from the pin as `shown at 2l, this 255 tapered portion 2 I, there is formed a small groove or recess 22, the bottom of which is vinclined downwardly and inwardly toward the axis of the l a direction to drive it off ofthe tapered, section reamer body` for a purpose yto be presently set forth.

For the purpose of holding the block I'I in position within the recess 5, there is provided a locke' i. ing block 23 having an outer cross sectional... shape adapted to snugly iit within the recess f 5. Because of this crosssectional shape and` the fact that the recess 5 isnitself of dovetail i i shape, as above mentioned, the block 23 can 1 not be moved laterally outwardly from this recess but Acan only be slid alongl the recess vin a longitudinal direction. This 'block 23 isprovided with a groove in its inner surface of a size adapted to receive the tapered portion 2l of the block I'I. The bottom of this groove is likewise tapered to a degree to cooperate with the taper on the block I1 and the block 23 is provided with a set screw' 24 adapted when screwed inwardly to engage the recess 22 in the block I'I and securethe block 23 in position.

In assembling the reamer and body just described the body I is first formed in the manner set forth and the ring 6 welded in place. The cutter Ill is then placed on the pin I2 andthe blocks I3 and I'i Welded onto the ends of these pins as illustrated. The block 23 is then slipped into place within the recess 5from the lower end thereof and is moved to a point adjacent the upper end of this recess. Next the tapered portion I6 of the block I3 is inserted into the'recess Il beneath the ring 6 and is driven home by one or more hammer blows against the block Il.

The block 23 is then slid along the recess 5` until it cverlies the tapered portion 2I of the block I1, and the block 23 is then vdriven tightly onto the tapered portion 2I byfmeans of blows of a hammer orother convenient means. After this has been done, the set screw 24 is tightened and the threads in the block 23 at the outer end of the set screw are peened to preventthe set screw from backing out.

It will be seen that the block AI3 is rigidly held` by virtue of the fact that it is tightly wedged beneath the ring E which is in turn'welded about the body I. The block I3 is also prevented from any lateral movement byvirtue of the fact that it ts snugly within the recess 4. v

The upper end lof the reamer pin I2 will like- Wise be nrmly held by the block I'I, this block being prevented from lateral movement by virtue of its lit with the outer portion of the recess 5 and by virtue of the t of its tapered end within the groove within the block 23. It will be prevented from outward movement in a radial direction and from longitudinal movement in an upward direction b-y virtue of the vwedging eiect of the block 23 within the recess 5 and of the tapered portion 2l within the groove in the block 23 respectively It is also to be noted that the block 23 cannot back off from its wedging engagement with the block I'I because of the fact that the set screw 24 will prevent such movement. It has been lnoted that the inner surface of the recess v22, within which the set screw lits, is inclined downcesses being of dovetail cross-section, a part over of this block 23 to slide backward toward re-v leased position would be opposed by the set screw because insuch sliding movement the `set screw would become more firmly wedged against the inclined bottom of the recess 22.

If and when it is desired to remove the vreamer' cutter from the reamer body I, it is only necessary to strike the block v23 with a hammer in 2|. -It will be necessaryto drive this block with 10 sufficient force to shear ofi the setr screw 24 whereupon the block 23 will slide upwardly in fthe recess 5 releasing kthe block 'I'I, after which 'the block I3 may be struck with a hammer to drive it from under the ring 6. 15 f 'From the foregoing, it will be apparent-that a means has been provided for mounting a reamer cutter'within a recess in a reamer body g i in amanner which will hold the. cutter rigidly and prevent it from being moved or dislodged fromm its position during drilling operation. It will'further be apparent that the meansdevsed will be found to be durable and Abecause of the relatively small number of parts involved, it will be found to be inexpensive to manufactureand substantially trouble free.

On the other hand, it will be apparent upon occasions when it is desired, the reamer cutter may be readily removed for replacement or repair without damaging the reamerbody orany other part of the device, with the 'exception vof the set screw, to such "an extent that it cannot be used again. f. v f Having described my invention', Iv claim:

' 1. In a reamer, a reamer body'having a major ggf recess in the outer surface thereof and a minor recess opening into each end of rsaid major recess, respectively one of said recesses being of rectangular cross-section and the other of said relying a portion of said'one recess to vform "a t'al pered pocket opening toward said major recess, a roller cutter adapted to be mounted insaid imajor recess, a shaft on which said cutter is" rotatably mounted, a' block `secured to eachl of L5k 4the opposite ends of said shaft, one of said blocks l having a tapered extension adapted to t within said pocket and theother of saidblockshaving a tapered extension adapted to rest in said `dovetail recess but of reduced width so that itisl not 50 as wide` as said dovetail recess and wedginglyl receive a vblock of a cross sectional shape adaptedv to wedgingly fitwithnsaid dovetail recess, and means engaging said last'named block'and said last named tapered extension to urge the last 55 named block into wedging engagement with, said;

last named tapered extension.

2. In a reamer, a reamer'bodyhaving amajor recess in the outer surface thereof and a minor recess opening into each end of said majork rei(5g) cess, respectively, one of saidvrecessesbeing of rectangular cross-section and the other of said vrecesses being of dovetail cross-section, a part overlying a portion of said one'recess to form a tapered pocket opening toward saidvmajor recess, c5

a roller cutterv `adapted to be rvmounted in said i Y Amajor recess, a shaft on which said cutter is rotatably mounted, a block secured to leach of .f the opposite ends of said shaft, vone of said blocks having a tapered extension adapted to t within ,10

said pocket and the other of said` blocks having a tapered extension `adapted to rest in said dovetail recess but of reduced widthso that it is not Aas wide as said dovetail recess and wedgingly receive a block of across sectional shape adapted-g5y to wedgngl'y fit Within said dovetail recess, and a set screw on said last named block and engaging said last named tapered extensionto urge the last named block into Wedging engagement with said last named tapered extension.

3. In a reamer, za reamer body having a major recess in the 'outery surface thereof and a minor recess opening into each end of said major recess, respectively, one of said recesses being of rectangular cross-section and the other of said recesses being of dovetail cross-section and providing a longitudinal outwardly tapered slideway, a partcverlying a portion of said one recess to form atapered pocket opening toward said major recessfa roller cutter adapted to be mounted in said major recess,\a shaft on which said cutter having a tapered extensionadapted to"fit within said pocket and the other of said blocks having a tapered extension adapted to rest in said dove' tail recessbut of reduced Width so that it isvnot as Wide as said dovetail recess and Wedgingly receive a block of a cross-sectional shape adapted to Wedgingly t Within a-set scr-ew on said last named block and engaging said last named tapered extension to urge the last named block `into Wedging engagement with said last named tapered extension.

KENNETH E. JONES.

is rotatably mounted, a block secured to each of the opposite ends of said shaft,vone of said blocks said dovetail recess, and 

